Friction-clutch.



Patented Aug. 5, I902.

0. A. FISHER.

FRICTION CLUTCH.

( Application filed Oct. 15. 1901.)

(No Model.)

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CHARLES ALBERT FISHER, OF TI-IQROLD, CANADA, ASSIGNOR OF ONE-TENTH TOCURT C. ANDREWS, OF NORTH TONAWANDA, NEWV YORK.

FRICTION-CLUTCH.

SPECIFICATION forming part of Letters Patent No. 706,400, dated August5, 1902. Application filed October 15, 1901. Serial No- 78,'720. lNpmcdel.)

To all whom it may concern:

Be it known that I, (ll-IARLES ALBERT FISHER, a citizen of theUnitedStates, residing at Thorold, in the Province of Ontario, Canada,have invented certain new and useful Improvements in Friction-Clutches;and

I do hereby declare the following to be a full,

clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to friction-clutches; and its primary object is toprovide a simple, inexpensive, and effective device of the characternamed in which the operative mechanism will be entirely inclosed', thusavoiding projecting parts and presenting only smooth surfaces on theexterior of the clutch. I thus avoid the danger of injury to workmencaused by the contact of their hands or clothing with projectingrevolving parts of the clutch.

The invention comprises a pulley loosely mounted upon a shaft, a diskfixed upon the shaft, friction devices carried by said disk, and asleeve slidably supported upon the shaft for operating the frictiondevices.

The construction of the improvement will be fully described hereinafterin connection withthe accompanying drawings, which form part of thisspecification, and its novel features will be defined in theappended'claims.

In the drawings, Figure 1 is an elevation of the clutch in'its closedposition. Fig. 2 is a similar view showing the clutch in its open orreleased position. Fig. 3is a section taken on the line 3 3 of Fig. 4.Fig. 4 is a transverse section showing the inner side of the disk andthe friction devices secured thereto in elevation; and Fig. 5 is adetail section,on an enlarged scale, of one of the pivotal supports ofthe friction devices.

The reference-numeral1 designatesashaft, upon which is loosely mounted apulley comprising a sleeve 2, a disk 3, and an annular horizontal flangei. The pulley is supported in position upon the shaft by a ring 5 and aset-screw 6.

7 designates a disk formed with an integral sleeve portion 8, which isfixed to the shaft by means of a suitable key 9. The sleeve 8 of thedisk is formed at diametrically opposite points with elongated slots10,within each of which is pivotally secu red an arm 11. The inner ends12 of these arms extend within the pulley, as shown in Fig. 3, and arehooked to engage the links 13, by mearisof which the arms are connectedto the hooked ends 14E of curved levers 15.

The levers 15 are pivotally secured to the inner side of the disk 7 atthe points 16 and at their outer ends to friction-shoes 17, said shoesbeing rounded to conform to the inner surface of the flange at of thepulley. The shoes 17 are oppositely disposed, as shown in Fig. 4, andare pivotally secured adjacent to their ends to links 18, the inner endsof which are pivotally secured to bosses 19, projecting from the innerside of the disk 7 and adjustably secured thereto by bolts 20 and nuts21. The bolts 20 are adjustably secured by setscrews 22.

The levers 15 are secured to the disk by coil-springs 23.

24=designatesasleeve slidably mounted upon the shaft and adapted to beforced over the arms 11 to press said armstoward each other and forcethe friction-shoes into engagement with the inner surface of the flange4 of the pulley. The sleeve 24 is provided with an integral groovedextension 25 to receive a shifting ring 26, adapted to be operated by alever 27, as illustrated in Fig. 1.

The operation of the mechanism as thus described is as follows: When thesleeve 24 is in the position shown in Fig. 2, the friction-shoes will beout of contact with the flange of the pulley, and said pulley will bethus released and will not turn with the shaft; but when the sleeve 2&is moved inward to the position shown in Figs. 1 and 3 the arms 11 willbe movedtoward each other, thus tilting the curved levers 15 and forcingthe shoes into frictional engagement with the inner surface of thepulley-flange 4. The pulley and disk are thus firmly locked together toturn with the shaft. When the sleeve 24 is moved outward to the positionshown in Fig. 2, the springs 23 retract the curved levers to releasethe-friction-shoes. By means of the bolts 20 and the set-screws 22 thefriction-sh0es may be adjusted to compensate for wear.

It will be noted that by the construction above described all of theoperative mechanism is inclosed within the pulley and smooth surfacesare presented on both sides of the device as well as on the periphery ofthe pulley, and hence the liability of injury to workmen or others isentirely avoided.

I would have it understood that the inven tion is not restricted to allof the details of construction shown and described, but that I reservethe right to make all such modifications and changes as may properlyfall within the scope of the invention as set forth in the followingclaims.

I claim-- I 1. A friction-clutch comprising a revoluble pulley, a fixeddisk, arms pivotally secured to the disk, levers 'fnl'crnmed upon thedisk and having friction-shoes, connections between the arms and levers,and laterallymovable means for operating the arms and levers.

2. A friction-clutch comprising a looselymounted pulley, a fixed diskhaving a slotted sleeve extension, arms pivotallysecu red within saidextension, oppositely-disposed levers fulcrumed nponsaid disk,connections between said arms and levers, a sliding sleeve for operatingsaid arms and friction-shoessecured to'said levers.

3. A friction-clutch comprising a looselymounted pulley; a fixed diskhaving a sleeve extension; arms pivotally secured within the CHARLESALBERT FISHER.

Witnesses:

F. O. MCCLEARY, HERBERT D. LAWSON.

